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Product

Control & signal cableMIL-DTL-13075 (WD-1/TT)4×Sn-Cu + 3×Steel (≥ 890 N)-55 °C to +80 °C HDPE + Nylon

WD-1-TT / WD-1A-TT Tactical Field Telephone WireMIL-DTL-13075 4×Sn-Cu + 3×steel composite-core HDPE/Nylon tactical field telephone wire

WD-1-TT / WD-1A-TT (MIL-DTL-13075) 2-conductor tactical field telephone wire (-55 to +80 °C) with a 7-strand bimetallic conductor (4 tinned copper + 3 galvanised steel strands, ≥ 890 N / 200 lbf break load), HDPE insulation, and an OD Nylon jacket.

Approved
Outdoor & humid
Ozone, UV & moisture
Anti-torsion braid
Order designation
WD-1/TT Twisted (RL-159/U)
Outer Ø ≈
4.10 mm
Wall thickness
1.10 mm
Total weight ≈
18.0 kg/km
Min. bend R (fixed)
25 mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Mil-Spec
MIL-DTL-13075
WD-1/TT twisted & WD-1A/TT zip
Composite core
4×Sn-Cu + 3×Fe
7×0.28 mm (~20 AWG / 0.43 mm²)
Tensile break
≥ 890 N (200 lb)
Withstands vehicle & tree spans
Dual wall
HDPE + Nylon
Moisture barrier + cut armour
Field temp.
-55…+80 °C
Arctic to desert tactical duty
Loop resistance
≤ 148 Ω/km
Up to 35 km voice / SHDSL range

Typical values for this cable type, based on MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field Wire — confirmed in the datasheet and quotation for your order.

Application fit

Is WD-1-TT / WD-1A-TT right for your machine?

Select WD-1/TT (twisted pair for reel recovery) or WD-1A/TT (lightly bonded parallel pair for high-speed canvas/pack dispensing) for military field telephones, SHDSL tactical modems, and blasting/firing lines.

Trailing & towing

Suitable

4×Sn-Cu + 3×steel strands per core yield ≥ 890 N (200 lbf) break strength for ground, tree, and vehicle payout.

Cylindrical / multi-layer drum

Suitable

Dispenses from DR-8, RL-159/U, or MX-306/G reels; tough Nylon skin slides over rocks without snagging.

Immersion & wet locations

Suitable

HDPE primary insulation maintains ≥ 500 MΩ·mile insulation resistance even when submerged in mud or wet trenches.

Typical machinesTactical Field Telephone Networks (TA-312 / TA-838 / TA-1042)Military Forward Operating Base SHDSL / VoIP LinksArtillery Fire-Control & Range Target TelemetryEOD / Demolition Firing & Initiator LinesEmergency Disaster-Relief Rapid Field Comms

Construction

Layer by layer

MIL-DTL-13075 construction: two insulated conductors (twisted in WD-1/TT or bonded at the jacket web in WD-1A/TT), each conductor stranded from 4×0.28 mm tinned copper + 3×0.28 mm galvanised steel wires, HDPE primary insulation, and olive-drab Nylon outer jacket (one conductor ridged for night tactile polarity).

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
14×Sn-Cu + 3×Steel composite core4 strands of tinned annealed copper (0.28 mm) laid around 3 strands of high-strength galvanised steel (0.28 mm)Combines copper conductivity (≤ 148 Ω/km loop) with ≥ 890 N (200 lbf) steel tensile strength
2HDPE primary dielectricHigh-density polyethylene primary insulation (~0.50 mm wall)Low dielectric loss (1 kHz attenuation ≤ 0.95 dB/km dry) and -55 °C cold flexibility
3Olive-drab Nylon outer jacketExtruded linear polyamide (Nylon) protective skin (0.15 mm wall, olive drab, 1 core ribbed for polarity)Gives extraordinary cut-through, rock-abrasion, and solvent resistance at ultra-light weight (18 kg/km)

WD-1/TT Twisted Pair (MIL-DTL-13075)

Helically twisted 2-conductor tactical field wire for RL-159/U and DR-8 reels (easy reeling & recovery)

WD-1A/TT Bonded Pair (MIL-DTL-13075)

Lightly bonded parallel-web 2-conductor tactical wire for MX-306/G backpack/vehicle high-speed payout without tangling

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field Wire. Values for your order are confirmed in the datasheet and quotation.

Electrical

Max. DC loop resistance
≤ 148 Ω/km (≤ 238 Ω/mile) at +20 °C
Characteristic impedance
Approx. 600 Ω at 1 kHz (135 Ω @ 1 MHz)
Attenuation at 1 kHz
≤ 0.95 dB/km dry · ≤ 1.9 dB/km wet
Dielectric withstand
1,500 V AC RMS / 500 V operating

Thermal

Tactical operating temp.
-55 °C to +80 °C (-67 °F to +176 °F)
Cold bend performance
-55 °C mandrel bend without cracking

Mechanical

Conductor stranding
4× tinned Cu + 3× galvanised steel (7×0.28 mm)
Min. breaking strength
≥ 890 N (200 lbf) complete pair
Single conductor OD
Approx. 2.05 mm · Pair width ~4.1 mm
Cable weight
Approx. 17–19 kg/km (60 lb/mile)

Resistance

Abrasion & cut-through
Tough polyamide (Nylon) outer jacket
Weather, mud & fungus
All-climate tactical immersion & UV rated

Reference standards

Military specification
MIL-DTL-13075 (formerly MIL-C-13075)
NATO Stock Number (NSN) ref.
6145-01-047-4293 / 6145-00-226-8812
RoHS & REACH
RoHS 3 & REACH compliant

Identification

Outer jacket colour
Olive Drab (OD) matte tactical finish
Polarity identification
Longitudinal tactile ridge on one conductor
Customs tariff (HS)
8544.49

Sizes

4 standard configurations (WD-1-TT / WD-1A-TT)

Engineering dimensions, conductor stranding, mass and electrical ratings for WD-1-TT / WD-1A-TT per MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field Wire.

Dimensions & weights
Order designationCross-section / sizeConductor buildWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard WD-1-TT / WD-1A-TT configurations
WD-1/TT Twisted (DR-8)1 PR × 20 AWG (4Cu+3Fe)Solid / Stranded Cu1.104.107.918.025
WD-1/TT Twisted (RL-159/U)1 PR × 20 AWG (4Cu+3Fe)Solid / Stranded Cu1.104.107.918.025
WD-1A/TT Bonded Pair1 PR × 20 AWG (4Cu+3Fe)Solid / Stranded Cu1.104.208.419.025
WD-1/TT Twisted (1000 m)1 PR × 20 AWG (4Cu+3Fe)Solid / Stranded Cu1.104.107.918.025
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal engineering values for WD-1-TT / WD-1A-TT subject to standard manufacturing tolerances per MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field Wire.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
Dielectric spark / high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field WireEvery manufactured length
Conductor DC resistance & continuity checkWithin maximum 20 °C resistance limit specified for WD-1-TT / WD-1A-TTEvery spool or drum length
Sample tests
Insulation resistance & dimensional verificationWall thickness, concentricity and insulation resistance per MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field WirePer production batch
Environmental, mechanical & EMC qualificationQualified to MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field Wire thermal, mechanical and environmental performance criteriaType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

MIL-DTL-13075 (formerly MIL-C-13075) WD-1/TT & WD-1A/TT Tactical Field WireCE (2014/35/EU) & RoHS 3 (2015/863/EU) CompliantREACH SVHC Compliance Verified

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

MIL-DTL-13075 WIRE WD-1/TT TACTICAL FIELD TELEPHONE TEBAOFLEX
Delivery form
Export wooden drums, tactical reels or coils
Standard lengths
100 m · 500 m · 1000 m (or custom cut lengths)
MOQ
100 m (stock sizes) · 300–500 m (custom build)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFWD-1-TT / WD-1A-TT Tactical Field Telephone Wire – technical datasheet4 sizes · construction, technical data, approvalsXLSXWD-1-TT / WD-1A-TT spec data (Excel)All 4 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What is the difference between WD-1/TT and WD-1A/TT?
Both use the exact same 4×tinned-copper + 3×galvanised-steel conductors, HDPE insulation, and olive-drab Nylon outer skin per MIL-DTL-13075. In WD-1/TT the two insulated conductors are helically twisted together so the cable can be payed out and recovered repeatedly on RL-159/U or DR-8 reels. In WD-1A/TT the two conductors are lightly bonded side-by-side so they pay out from coreless MX-306/G dispenser packs at high speed (vehicle or aircraft deployment) without kinking.
Why does each conductor combine 4 tinned copper strands with 3 galvanised steel strands?
Pure annealed copper wire stretches and snaps when pulled across rough terrain, suspended between trees, or driven over by tactical vehicles. Combining 3 high-carbon galvanised steel core strands with 4 outer tinned copper strands gives a breaking load ≥ 890 N (200 lbf) while keeping DC loop resistance ≤ 148 Ω/km.
How do signal troops identify conductor polarity in total darkness?
One of the two Nylon-jacketed conductors has a continuous raised longitudinal ridge (rib) moulded into its outer surface so operators can feel Tip/Ring polarity by touch during night splicing.
When should I choose 2-pair WF-16/U over 1-pair WD-1/TT?
Choose 2-pair WF-16/U (MIL-C-55686) when four-wire full-duplex data/voice circuits or conditioned digital trunks are needed in a single payout run.

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WD-1-TT / WD-1A-TT Tactical Field Telephone Wire

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